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        <h3>sin曲线</h3>
        <canvas id="canvas-sin" width="240" height="240"></canvas>
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        <h3>cos曲线</h3>
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        <h3>tan曲线</h3>
        <canvas id="canvas-tan" width="240" height="240"></canvas>
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    <div style="clear: both; padding-top:20px">
        <h3>不同角度点的线段</h3>
        <canvas id="canvas-sin-test" width="240" height="240"></canvas>
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        <h3>反余弦</h3>
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    <div style="float: left; padding-top:20px">
        <h3>线段随着鼠标转动</h3>
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